Twisted Siblings [ a Jelsa fanfic]

Jack and Elsa are very close. Even their parents feel that they're like siblings. One day Elsa found Jack sleeping in the storage room holding a box. Elsa got curious so she open it without Jack knowing. After she open it she was surprised!
Because inside it was full of pictures of him when he was young and before Elsa met Jack. But, Elsa realised that in every pictures in that box, there's Elsa.
Why is that?

WHOA!!!!!! Where have they been if they haven't been living together? Are they really twins or are they lovers? Im confused a little. If they're actual twins then why is she so worked up if he's dating another girl or not. NVM. I c y yall call it "Twisted Siblings".